What is Forms Authentication in ASP.net Webforms:• End user make a request, then browser will send the associated cookie stored in the client machines.• When request is received from server end, server examines the request and validate for the <b>"Authentication Cookie".</b>• If cookie is found, server confirms the identity of the users, and allows him/ her to further process.• If cookie is not found</b>, then server confirms that user is an unauthenticated user. In this case will redirect him back to login page again.

Just now only I prepared an article for the same, I request you to please go through the below link and read the article fully if you have any doubts please revert back to me.

Hai Praveen,We can create the Form based authentication and then we can validate the request-whether the request is valid and authenticated.You can go to the below link for step by step process of implementing the Form based authentication: